MIAMI (CBSMiami) – Thousands of South Florida runners will lace-up for Sunday’s Miami Marathon and Half Marathon, but drivers in the area will have to practice patience.

That’s because the event will shut down parts of the MacArthur Causeway, Venetian Causeway, North Miami Avenue, South Miami Avenue, South Bayshore Drive and Biscayne Boulevard throughout the day. However, all vehicles will be able to get to all businesses and residences in the affected areas.

Sunday morning there will be lane reductions going east on the MacArthur Causeway from 6:15-8:15 a.m. and on the Venetian Causeway going westbound from 6:45 a.m. until 9:30p.m.

Starting at 6:30 a.m., drivers on N Miami Avenue between 15th and Flagler Street could experience delays until 10:30 a.m. due to lane closures.

All traffic on S. Miami Avene between SW 15th and SW 32nd could experience delays from 6:35 a.m. until 11:00 a.m. and on S. Bayshore Dr., between MCFarlane and HaLasee St., from 7:00 a.m. until noon.

Miami police officers will be on hand to help direct traffic.

Drivers are advised to carefully plan their routes, especially during the morning hours when the event is in full swing.

The race course begins at 6:15 a.m. at AmericanAirlines Arena, heads north and continues through Miami Beach, Downtown Miami, Little Havana, Coconut Grove, and Coral Gables before returning downtown for a finish at Bayfront Park.

Approximately 25,000 runners and walkers are expected to participate in the twelfth annual event. Friends, family and curious spectators will line the 26.2 mile route to cheer on runners.